Is it normal for DeCap to get 0 value leakage power when running liberate?

Our soi DeCap with 5 terminals (VBGP/VBGN is the 5^th terminal) share the same power template with standard cells, however, the leakage for DeCap is 0 value while standard cells get leakage power like 0.22345. Could you please help me find where the problem might be and how could I fix it?

Our lib goes like this:

cell (DCAP4_liberate) {

    area : 0;

    cell_leakage_power : 0;

    pg_pin (GND) {

      pg_type : primary_ground;

      voltage_name : "GND";

    }

    pg_pin (VDD) {

      pg_type : primary_power;

      voltage_name : "VDD";

    }

    leakage_power () {

      value : 0;

      related_pg_pin : VDD;

    }

  }

Our char.tcl goes like:

set_operating_condition -voltage 1.8 -temp 25

set_var extsim_exclusive 0

define_leafcell \

         -type pmos_soi \

         -pin_position { 0 1 2 3 4 }  \

         ph

define_leafcell \

         -type nmos_soi \

         -pin_position { 0 1 2 3 4 }  \

         nh

source ${rundir}/TEMPLATE/template180_dcap.tcl

set_var extsim_model_include ${rundir}/MODELS/include_models180.sp

foreach cell $cells {

    lappend spicefiles /my_liberate/NETLIST/${cell}.pex.netlist

}

read_spice $spicefiles

char_library -extsim spectre -ccs -ecsm -cells ${cells}

template180_dcap.tcl goes like：

set_var def_arc_msg_level 0

set_var process_match_pins_to_ports 1

set_vdd -no_model VBGP 1.8

set_vdd -no_model VBGN 0

set_var pin_based_power 0

define_template -type power \

          -index_1 {0.0317486 0.0677575 0.144607 0.308619 0.658652 1.40569 3}\

          -index_2 {0.0210989 0.049137 0.114435 0.266506 0.620664 1.44546 3.36632}\

         power_template_7x7

set cells {\

DCAP4_liberate\

}

if {[ALAPI_active_cell "DCAP4_liberate"]} {

define_cell \

       -power power_template_7x7 \

       DCAP4_liberate

}